Dynamic Diffuse Global Illumination (DDGI)

[JeGX]

Dynamic Diffuse Global Illumination (DDGI) is a technique for computing diffuse lighting with ray tracing to create changing, realistic rendering for games. It allows developers to extend their existing light probe tools, knowledge, and experience with ray tracing to eliminate bake times and avoid light leaking.

Hardware-accelerated programmable ray tracing is now accessable through DXR, VulkanRT, OptiX, Unreal Engine, and Unity. This enables many ways to compute global illumination. DDGI is a new strategy for lighting that expands developers' options.

Part 2
This is a simplified introduction to the core concepts of global illumination for real-time application developers. The focus is on introducing the terms needed to understand Dynamic Diffuse Global Illumination.

Links:
- Part 1: Dynamic Diffuse Global Illumination
- Part 2: Global Illumination

[JeGX]

This part of the DDGI article describes integrated ray-traced glossy GI and dynamic diffuse GI at a level suitable for a product manager or art director to begin evaluating the technique. I describe the previous state of the art techniques and show many examples of DDGI handling particularly difficult cases.

Link: https://morgan3d.github.io/articles/2019-04-01-ddgi/overview.html